The diagram below shows the electron arrangements of magnesium and oxygen: a) Draw a diagram showing how a bond is made between magnesium and oxygen. (2 marks) b) What name is given to this type of chemical bond? (1 mark) (Marks available: 3) Answer Answer outline and marking scheme for question: 1 a) (2 electrons moving = 1 mark) (complete transfer = 1 mark) b) Ionic (1 mark) (Total = 3 marks) a) What type of chemical bond would you expect in hydrogen fluoride, HF? (1 mark) b) Draw a diagram to show how this bond is formed. (2 marks) (Marks available: 3) Answer Answer outline and marking scheme for question: 2 a) Covalent (1 mark) b) (1 mark = 1 shared pair electrons) (1 mark = 1 electron from each atom) (Total = 3 marks) Look at the diagram below: a) Which type of structure is shown in the diagram? (1 mark) b) Will a material with this structure be able to conduct electricity? Explain your answer. (2 marks) (Marks available: 3) Answer Answer outline and marking scheme for question: 3 a) Metallic. (1 mark) b) The material will be able to conduct electricity, (1 mark) because there are free electrons that are able to move through the structure. (1 mark) (Total = 3 marks) Look at the table below: Substance: Melting point (°C): A 445 B 1907 C -7 a) Which substance, A, B or C could have a metallic structure? (1 mark) b) Which substance, A, B or C could have a simple covalent structure? (1 mark) (Marks available: 2) Answer Answer outline and marking scheme for question: 4 a) B (highest melting point) (1 mark) b) C (lowest melting point) (1 mark) (Total = 2 marks)